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From "Tim Armstrong (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-8954: Uncorrelated scalar subqueries in the select list
Date Sat, 04 Jul 2020 18:22:26 GMT
Tim Armstrong has posted comments on this change. ( )

Change subject: IMPALA-8954: Uncorrelated scalar subqueries in the select list

Patch Set 8: Code-Review+2


I had a few nits about comments. I can +2 and merge after those are cleaned up. I was going
to do that myself by I wasn't sure what one of them meant.
File fe/src/main/java/org/apache/impala/analysis/
PS3, Line 1113: 
nit: implemented
File fe/src/main/java/org/apache/impala/analysis/
PS5, Line 1114: implemeted
nit: implemented
PS5, Line 1126: flatten
nit: flattened
PS5, Line 1136: gaurantee
nit: guarantee
File testdata/workloads/functional-planner/queries/PlannerTest/tpcds-all.test:
> Good point added an end user sample query which illustrates this.
On a related note, we probably *should* be doing a broadcast when the right input is tiny
regardless of the size of the input. There's no sense in setting up the extra fragment/exchange
in that case. But I doubt this makes much of a difference.

Obviously we don't want to do this in this patch, and it probably isn't that important in
File testdata/workloads/functional-query/queries/QueryTest/subquery.test:
PS3, Line 1086: 
Not sure what this means - without grouping?

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: Ibcf55d26889aa01d69bb85f18c9241dda095fb66
Gerrit-Change-Number: 16007
Gerrit-PatchSet: 8
Gerrit-Owner: Shant Hovsepian <>
Gerrit-Reviewer: Aman Sinha <>
Gerrit-Reviewer: Fang-Yu Rao <>
Gerrit-Reviewer: Impala Public Jenkins <>
Gerrit-Reviewer: Shant Hovsepian <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-Comment-Date: Sat, 04 Jul 2020 18:22:26 +0000
Gerrit-HasComments: Yes

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